The SiMF9/4-11D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 6.85 to 11 GHz, Center Frequency 8.93 GHz, Insertion Loss 1.5 dB, Rejection 30 dB @6.1GHz&12GHz, 40 dB @5.8GHz&12.05GHz, 60 dB @DC~5GHz, 50 dB @14~20GHz, Upper Rejection 30 to 50 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF9/4-11D2 can be seen below.